/*
  cpt-city: pm/f-21-22-23 (cpt)

  Various gradients from Gnuplot: the original default pm3d
  colour gradient by Petr Mikulík from Masaryk University,
  nice rgb schemes listed in “help palette rgbformulae”
  and gradients from the pm3dcolors.dem demo script

  author: Petr Mikulik
  copyright: GPLv2
  year: 2006
  url: https://phillips.shef.ac.uk/pub/cpt-city/pm
*/
linear-gradient(
  0deg,
  rgb(  0,   0,   0)   0.000%,
  rgb( 12,   0,   0)   1.587%,
  rgb( 24,   0,   0)   3.175%,
  rgb( 36,   0,   0)   4.762%,
  rgb( 49,   0,   0)   6.349%,
  rgb( 61,   0,   0)   7.936%,
  rgb( 73,   0,   0)   9.524%,
  rgb( 85,   0,   0)  11.111%,
  rgb( 97,   0,   0)  12.698%,
  rgb(109,   0,   0)  14.286%,
  rgb(121,   0,   0)  15.873%,
  rgb(134,   0,   0)  17.460%,
  rgb(146,   0,   0)  19.048%,
  rgb(158,   0,   0)  20.635%,
  rgb(170,   0,   0)  22.222%,
  rgb(182,   0,   0)  23.809%,
  rgb(194,   0,   0)  25.397%,
  rgb(206,   0,   0)  26.984%,
  rgb(219,   0,   0)  28.571%,
  rgb(231,   0,   0)  30.159%,
  rgb(243,   0,   0)  31.746%,
  rgb(255,   0,   0)  33.333%,
  rgb(255,  12,   0)  34.921%,
  rgb(255,  24,   0)  36.508%,
  rgb(255,  36,   0)  38.095%,
  rgb(255,  49,   0)  39.682%,
  rgb(255,  61,   0)  41.270%,
  rgb(255,  73,   0)  42.857%,
  rgb(255,  85,   0)  44.444%,
  rgb(255,  97,   0)  46.032%,
  rgb(255, 109,   0)  47.619%,
  rgb(255, 121,   0)  49.206%,
  rgb(255, 134,   0)  50.794%,
  rgb(255, 146,   0)  52.381%,
  rgb(255, 158,   0)  53.968%,
  rgb(255, 170,   0)  55.556%,
  rgb(255, 182,   0)  57.143%,
  rgb(255, 194,   0)  58.730%,
  rgb(255, 206,   0)  60.318%,
  rgb(255, 219,   0)  61.905%,
  rgb(255, 231,   0)  63.492%,
  rgb(255, 243,   0)  65.079%,
  rgb(255, 255,   0)  66.667%,
  rgb(255, 255,  12)  68.254%,
  rgb(255, 255,  24)  69.841%,
  rgb(255, 255,  36)  71.429%,
  rgb(255, 255,  49)  73.016%,
  rgb(255, 255,  61)  74.603%,
  rgb(255, 255,  73)  76.191%,
  rgb(255, 255,  85)  77.778%,
  rgb(255, 255,  97)  79.365%,
  rgb(255, 255, 109)  80.952%,
  rgb(255, 255, 121)  82.540%,
  rgb(255, 255, 134)  84.127%,
  rgb(255, 255, 146)  85.714%,
  rgb(255, 255, 158)  87.302%,
  rgb(255, 255, 170)  88.889%,
  rgb(255, 255, 182)  90.476%,
  rgb(255, 255, 194)  92.064%,
  rgb(255, 255, 206)  93.651%,
  rgb(255, 255, 219)  95.238%,
  rgb(255, 255, 231)  96.825%,
  rgb(255, 255, 243)  98.413%,
  rgb(255, 255, 255) 100.000%
);